View the book

Read Online
(602.6 K)PDF
(55.5 K)EPUB
Kindle
Daisy
(20.9 K)Full Text
(145.2 K)DjVu

All Files: HTTPS

Resources

Bookmark

Control and Identification of Turbulent Boundary Layer Separation (2004)

Author: Seifert, Avi; Pack-Melton, La Tuni
Subject: FEEDBACK CONTROL; NONLINEARITY; RICCATI EQUATION; EQUATIONS OF STATE; REGULATORS
Year: 2004
Language: English
Book contributor: NASA
Collection: nasa_techdocs

Description

Effective delay of turbulent boundary layer separation could be achieved via closed-loop control. Constructing such a system requires that sensor data be processed, real-time, and fed into the controller to determine the output. Current methods for detection of turbulent boundary layer separation are lacking the capability of localized, fast and reliable identification of the boundary layer state. A method is proposed for short-time FFT processing of time series, measured by hot-film sensors, with the purpose of identifying the alternation of the balance between small and large scales as the boundary layer separates, favoring the large scales. The method has been validated by comparison to other criteria of separation detection and over a range of baseline and controlled flow conditions on a simplified high-lift system, incorporating active flow control.

Creative Commons license: Public Domain

Be the first to write a review
Downloaded 62 times Reviews

Selected metadata

Identifier:	nasa_techdoc_20040111309
Document-source:	CASI
Documentid:	20040111309
Nasa-center:	Langley Research Center
Online-source:	http://wayback.archive-it.org/1792/20100214152306/http://hdl.handle.net/2060/20040111309
Original-nasa-rights:	Unclassified; No Copyright; Unlimited; Publicly available;
Report-number:	NASA/CR-2004-213245; NIA-2004-08
Updated-added-to-ntrs:	2005-08-25
Licenseurl:	http://creativecommons.org/licenses/publicdomain/
Mediatype:	texts
Rights:	Public Domain
Identifier-access:	http://www.archive.org/details/nasa_techdoc_20040111309
Identifier-ark:	ark:/13960/t9t15wn45
Ppi:	300
Ocr:	ABBYY FineReader 8.0